Lifting-jack



H. AUSTIN.

LIFTING JACK.

(No Model.)

Patented Mar. 31

. Attbrneys UNITED STATES PATENT OFFICE.

HENRY AUSTIN, OF SEYMOUR LAKE, MICHIGAN.

LlFTlNG-JACK.

SPECIFICATION forming part. of Letters Patent N0. 314,908, dated March31, 1885.

- Application filed September 17, 1884. (No model.) 1

To all whom it may concern.-

Be it known that I, HENRY AUSTIN, a citizen of the United States,residing at Seymour Lake, in the county of Oakland and State ofMichigan, have invented a new and useful Improvement in Lifting-Jacks,of which the following is a specification, reference being had to theaccompanyingdrawings.

This invention relates to lifting-jacks; and it has forits object toprovide a device of this character which shall have considerablelifting-power with a small expenditure of force, and which can bemanipulated with ease and rapidity.

A further object of the invention is to provide a device which shallpossess superior advantages over others of its class in point ofsimplicity, durability, inexpensiveness, and

. general efiiciency.

To these ends the said invention consists in certain details ofconstruction and combination of parts, as hereinafter set forth, andparticularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a perspective view of myimproved liftingjack. Fig. 2 is a longitudinal vertical section of thesame. Fig. 3 is a side view of a modified form. Fig. 4 is a verticalsection of the same on the line a; .r, and Fig. 5 is a detail sectionalview.

Like letters are used to indicate corresponding parts in the severalfigures.

Referring to the drawings, Adesignates the base of my improved lifting-jack, and B B two uprights or standards, which have their lower endsmortised in the base, extending upward, and arranged parallel to eachother, a space, 0, being left between the same.

D designates a lifting-bar working in the said space G and slotted ateach end, as at E E, rods F F extending across the space 0 andconnecting the uprights or standards, said rods fitting in the slots E,and having guide-blocks G G on opposite sides of the lifting-bar toguide the latter in its vertical movements.

H designates an operating-lever having its inner end bifurcated orslotted at I, and curved inward and pivoted to the lower end of thelifting-bar D. A connecting-bar, J, is pivoted at one end within theslotted end of the operating-lever, and at the other end to a rod, K,which is fitted in the uprights or standards,

saidi rod K having disks or blocks mounted thereon on each side of theconnectingbar J.

L designates a vertically-adjustable block, triangular in form, havingits edges faced with metal, as at M, the ends a a of this metallic stripextending rearward and slotted at b b to receive the bar D. The latteris provided with teeth (I on its front edge, which are adapted to beengaged by the front wall of the slots b, so that by moving the block Linward it can .beadjusted at any point on the bar. As seen, the teeth onthe bar D extend down to the intermediate bar, F, the blocks G on thesame limiting the movement of the block in the adjustment thereof.

The operation of my invention will be readily understood from theforegoing description, taken in connection with the annexed draw-- ings.

In using my improved jack the block L is pushed inward until the frontwall or edge of the slot 12 comes into engagement with the teeth on thebar D, so as to support the block. The operating-lever is then pusheddown to cause the connectingbar J to move inward and the bar D to moveupward, the slots E E moving over the rods F and guiding the movement ofsaid bar D. When the latter israised to its highest point, (shown indotted lines, Fig. 2,) the connecting-bar J stands on a line with andforms a support for the bar D, the upward movement of the latter raisingthe block L correspondingly. WVhen it is desired the lower the jack, theblock L is drawn out to disengage the front wall of the slot from theteeth of the bar D, allowing the said block to drop down, theoperating-lever H being then drawn up into the position shown in fulllines, Fig. 2, this movement of the lever drawing the bar D down intothe normal position.

In Figs. 3 and i is shown a modified form of the lifting-jack, thedifference consisting in making the bearings of the bar D movable inplace of moving the latter through its be'arings. As seen, the ends ofthe bar D have the rods F F extending outward and working in guide-slotsN N in the sides of the uprights or standards.

The operation of this device is the same as that above described, andtherefore need not be repeated here.

It willbe apparent that I may make these and other slight modificationsinthe struction without departing from the spirit or scope of thepresent invention. The upper end of the connecting-bar J and the lowerend of the bar D are beveled off, as seen at e f, so as to fit togetherwhen the device is in the raised position.

It will be seen that the action of my device is positive and certain,and by means of the same heavy articlessnch as wagons-may be raised andupheld with ease and with very little exertion. The adjustment is suchthat the device can be accommodated to difi'erent heights and elevatethe articles to different points. It will be observed that the block isadjusted along the bar D to suit the height of the article when theoperating-lever is Worked to elevate the article off the ground.

This jack has considerable lifting-power with a small expenditure offorce, and is manipulated with ease and rapidity.

It is simple in construction, cannot get out of order, and will prove ofgreat utility for the purposes intended.

Having'described my invention, I claim details of con- I 1. In alifting-jack, the combination, witha I suitable supporting base anduprights, of a vertically-movable bar, a block adjustable on the same, alever pivoted to the bar, and a connecting-bar pivoted to the lever andarranged to support the bar in its raised position, as set forth.

2. In a lifting-jack, the combination, with a suitable supporting-baseand a pair of uprights, of a vertically-movable bar working between theuprights and having teeth on one of its faces, a block adapted to engagewith lever connected to the bar, and a connectingbar pivoted at one endto the uprights and attached to the lever, arranged and operating as setforth.

In testimony that I claim the foregoing as my own I have hereto aifixedmy signature in presence 0t two witnesses.

HENRY AUSTIN.

IVitnesses:

A. S. VVARNER, RALPH McLEAN.

the teeth so as to be vertically adjustable, a

